Back-pedaling coaster-brake.



ALEXANDER P. MORROW, OF ELMIRA, NEW YORK.

' BACK-PEDALIN G- COASTER-BRAKE.

Specification of Letters Patent.

Patented Fei). 9, 1909.

Applicationvled September 1'7, 1906. Serial No. 335,039.

To all 'whom it may concern: Be it known that I, ALEXANDER P. Mon- Row, a citizen of the United States,` and resident of Elmira, in the county of Chemung and State of New York, have invented certain new and useful Improvements in .Back- Pedaling Coaster-Brakesof which thefollowing is a specification.

This invention relates to back pedaling coaster brakes for bicycles and other vehicles, and has for its object to simplify the construction and increase Athe efficiency of these devices. lts novel features will be disclosed in the course of the specification.

In the drawings z-Figure 1 is a longitudinal vertical section; Fig. 2 is a transverse section on the line 2 2 of Fig. 1 Fig. 3 is 4an elevation of the brake sleeve; Fig. 4 is a similar view of the brake shoe; Fig. 5 is a side elevation of the clutch sleeve; Fig. 6 is an end view of the same; Fig; 7 is a side elevation of the clutch ring 5 and Fig. 8 is a partial elevation of the driver.

The device comprises a shaft or axle 1, and

an outer sleeve or hub 2, within which are the driving, coasting and braking mechanisms.

A block 3 is held stationary upon one end of the shaft 1 by means of a nut 4, and a squared projection 5 which enters the'usual notch in the rear fork of a bicycle frame. Ball bearings 6 are retained in a groove in said block by means of a compressible split ring 7, of L shaped section, of which the inner flange engages the groove, and the outer flange retains the balls.

On the opposite end of the shaft 1 is a cone 8, locked 1n place by a nut 9. A driving member 10, having the usual sprocket 11 thereon, is partially supported by ball bearings 12. 'Another set of balls 13 are heldin place on the driving member by a retaining ring 14 (see Fig. 8). The hub 2 is carried upon the balls 6 and 13.

Within the hub, and supported upon the shaft 1, is a square sleeve 15, having near one end a series of ratchet teeth 16, projected in a plane transverse to the axis of said sleeve. Two semicircular wedges 17 project from the bases of the ratchet teeth, and in the highest portion of each wedge is cut an acute-angled recess 18 (Fig. 5). The formation of the notches 1S leaves on each wedge a tongue 19, the inner face 20 of which is inclined also. Similar wedges 21 are formed on the inner end of the driver 10, having notches 22 and inclined faces 23 in their high portions.

A ring 24, having projections on one end (Fig. 7) encircles the wedges 21 and 17, in such position that the projections 25 will Vbe engaged by the ratchet teeth 16 when the engage the projections 25 on the ring 24, and Y the latter, turning with the said sleeve, revolvesthe hub 2 by reason of its connection with the lug 26. Upon stopping the driving member 10, the hub 2 turns under its momentum, and the ring 24 travels with it, all the other parts remaining stationary. rIhe beveled sides 25" of the rejections 25 act as cams upon the beveled sides 16a of the ratchet teeth 16, and the latter are forced to the left, leaving the ring 24 free to revolve with the hub.

rlhe braking device consists of a ring or shoe 2S, split at 29, the split being widened to form acutely beveled faces 30. A block 31 is carried by the s uared portion of the sleeve 15, and lits snug y within the ring 28. A wedge 32 upon said block is adapted to enter between the beveled faces of the ring, and to expand the latter when forced endwise.

In o erating the brake, which is done as usual, fly the backward rotation of the crank shaft, the cam action between the semicircular wedge faces 17 and 21 causes the sleeve 15 to move toward the left. rIhe backs of the teeth lstrike the end of the brake shoe 28, so that it and the block 31 are moved with the sleeve 15. Teeth 33 on said block then engage similar teeth 34 on the block 3, and the brake members are thereby prevented from turning. Further backward rotation of the driving member 10 causes the shoe 28 to be forced still farther to the left,

and the wedge 32 expands it against the inner surface'of the hub 2, bringing the latter to a sto Upon rotating the driver 10 forward, the contractile force of the shoe 28 causes it to slide to the right on the Wedge 32, and this release the brake. In this form of back pedaling brake the braking members revolve with the heb dering the forward rotation, or driving operation, and are at rest in the coasting position. 'lhe only revolving parts while coasting are the heb 2 and the ring 24. rlhis constrnction permits of very powerfnl braking action for a small amoiint of foot-pressnre on the pedal, and the brake releases itself .vithort forward pedaling. rl here are only ive working parts with the exception of the heb and cones, and their simple constriction permits of ready assembling by inexperienced persons, and minimizes the liability of breakage.

V hat I claim is 1. In a back pedaling brake for cycles, a driving member; a heb a stationary block, adapted to be attached to the frame of the cycle, and having a brake clLteh member; a movable brake shoe a brake carrier, revolnble with said driving member, having Wedge means for actiating said brake shoe sirpported by said carrier, and adapted to be moved into engagement with said brake clntch; a brake acti ator, revolnble with the driving member, and adapted on back pedaling to move said brake carrier into engagement with said brake el'L teh member, and to aettate said brake shoe by moving it in the same direction with reference to the brake carrier; means for moving said brake actrator in the direction of said brake clutch member on back pedaling; and means for cai sing driving engagement between said driving member and said hnb on forward pedaling.

2. In a back pedaling brake for cycles, a driving member; a hub av stationary block, adapted to be attached to the frame of the eusse cycle, and having a brake clnteh member; a movable brake shoe; a brake actuator revolnble with the driving member, and

adapted on back pedaling to move said brake shoe in the direction of said brake clutch member; a brake carrier, revolnble with said brake actuator, having wedge means for aetnating said brake shoe, adapted to be moved by engagement with said brake shoe into engagement with said brake ehl'ch member, and to actnate said brake shoe when the latter is moved with reference thereto in the direction of said brake ehteh member; cam connections between said brake aetiator and said driving member, whereby the former is moved in the direetion of said. brake cleteh member on bach pedaling; and means for ear sing driving engagement between said driving` ,member and said heb on forward pedaling.

3. A driving clntch for free wheel bicycles, comprising a revolirble hib having a cli tch member, a sleeve sipported ipon the axle having a clLtch member adapted to engage the cliitch member upon the heb and also having on its outer-side oppositely directed cam si rfaces with a recess between them, and a driving member having' on its inner side a cnrved wedge-shaped hook extending in the direction of rotation for forward driving and engaging an abrtnient ai the end of the recess between the cani srrfaces of the said sleeve for driving the hnb forward, and adapted also io engage said cam si rfaces to shift said sleeve in and ont of engagement with the heb` ALEXANDER P, MORHOW.

Iitnesses lGEO. S. GREENE, GEO. H. COUPE. 

